commands: Print cask commands

Library/Homebrew/cask/cmd.rb

@@ -88,6 +88,10 @@ module Cask
       @lookup.fetch(command_name, nil)
     end
 
+    def self.aliases
+      ALIASES
+    end
+
     def self.run(*args)
       new(*args).run
     end

Library/Homebrew/cmd/commands.rb

@@ -36,9 +36,18 @@ module Homebrew
     ohai "Built-in developer commands", Formatter.columns(Commands.internal_developer_commands)
 
     external_commands = Commands.external_commands
-    return if external_commands.blank?
+    if external_commands.present?
+      puts
+      ohai "External commands", Formatter.columns(external_commands)
+    end
 
     puts
-    ohai "External commands", Formatter.columns(external_commands)
+    ohai "Cask commands", Formatter.columns(Commands.cask_internal_commands)
+
+    cask_external_commands = Commands.cask_external_commands
+    if cask_external_commands.present?
+      puts
+      ohai "External cask commands", Formatter.columns(cask_external_commands)
+    end
   end
 end

Library/Homebrew/commands.rb

@@ -1,5 +1,7 @@
 # frozen_string_literal: true
 
+require 'cask/cmd'
+
 module Commands
   module_function
 
@@ -89,6 +91,7 @@ module Commands
     cmds += internal_developer_commands
     cmds += external_commands
     cmds += internal_commands_aliases if aliases
+    cmds += cask_commands(aliases: aliases).map { |cmd| "cask #{cmd}" }
     cmds.sort
   end
 
@@ -129,11 +132,49 @@ module Commands
     Tap.cmd_directories.flat_map do |path|
       find_commands(path).select(&:executable?)
                          .map(&method(:basename_without_extension))
-                         .map { |p| p.to_s.sub(/^brew(cask)?-/, '\1 ').strip }
+                         .map { |p| p.to_s.delete_prefix("brew-").strip }
     end.map(&:to_s)
        .sort
   end
 
+  def cask_commands(aliases: false)
+    cmds = cask_internal_commands
+    cmds += cask_internal_command_aliases if aliases
+    cmds += cask_unstable_internal_commands
+    cmds += cask_external_commands
+    cmds
+  end
+
+  def cask_internal_commands
+    Cask::Cmd.commands - cask_unstable_internal_commands
+  end
+
+  def cask_unstable_internal_commands
+    Cask::Cmd.commands.select do |command|
+      command.start_with? "_"
+    end
+  end
+
+  def cask_internal_command_aliases
+    Cask::Cmd.aliases.keys
+  end
+
+  def cask_external_commands
+    tap_cmd_directories = Tap.cmd_directories
+    path = PATH.new(tap_cmd_directories, ENV["HOMEBREW_PATH"])
+
+    path.flat_map do |search_path|
+      find_commands(search_path).map do |possible_command|
+        p = possible_command.to_path
+        command_name = p.match(/brewcask-(.*)\.rb/) { |data| data[1].delete_suffix(".rb") }
+        if command_name.blank? && possible_command.executable?
+          command_name = p.match(/brewcask-(.*)/) { |data| data[1] }
+        end
+        command_name
+      end.compact
+    end
+  end
+
   def basename_without_extension(path)
     path.basename(path.extname)
   end

Library/Homebrew/keg.rb

@@ -4,6 +4,7 @@ require "keg_relocate"
 require "language/python"
 require "lock_file"
 require "ostruct"
+require "extend/cachable"
 
 class Keg
   extend Cachable